Calc Engine

Calc Engine™ — The Calculator That Fits How You Work

Whether you're splitting a dinner bill, plotting an equation, or working through bitwise logic, Calc Engine meets you where you are. It's a beautiful, fully customizable calculator that grows with you — and syncs seamlessly across iPhone, iPad, Mac, and Apple Watch.

Make it look and feel like yours
• Choose from rich color themes to match your style
• Pick the fonts and key shapes that feel right in your hands
• A calculator you actually enjoy opening

Design keyboards your way
• Build your own keyboard pages — drag any key from a curated library onto a 4×5, 5×5, or 6×5 grid
• Mix digits, operators, scientific functions, your own constants — anything you reach for often, all in one place
• Set a long-press alternate on any key so a single tile handles a primary and secondary action
• Name each keyboard, pick its icon, and reorder it alongside the standard pages — your custom keyboards show up right where you'd expect them
• Enable or disable any page (built-in or custom) per device

Build your personal math library
• Define your own functions with up to three parameters — name them whatever makes sense to you
• Save the constants you use all the time and insert them with a single tap
• Full calculation history, automatically saved — scroll back anytime

Powerful math, always within reach
• Trig (radians or degrees), logarithms, exponentials, roots, and more — there when you need them, out of the way when you don't
• Live results as you type, so you always know where you're headed
• Per-function rounding built in — perfect for money, measurements, or anything that needs a clean output

Convert between hundreds of units in seconds
• Tap a value, then any two units to see the conversion live — miles to km, lb to kg, °F to °C, gal to L, anything you need
• 250+ built-in units across 40+ categories: length, mass, volume, temperature, time, speed, angle, energy, power, pressure, electrical, magnetic, optical, radioactivity, data, and more
• Favorite the categories you actually use so they sit at the top — synced across your devices automatically
• Build your own functions with conversions baked in — define a formula once and reuse it forever

See your equations come to life in graphs
• Plot equations like x = y² or sin(x)